Reddy,
Just do a general type page then. I have asked her. She didn't know what they wanted to be called and then they got the really bad news, and if its what the doctors say then, the grandparents won't get the chance to choose what to be called. So in then end two sets of grandma and grandpa pages won't make a difference at all. They will just be a place to put memories.
I honestly am not going to harrass her via pm about the names for grandparents. She has enough going on right now.
So please stop stressing about the title. Either way it will be fine.
If you don't want to make the pages, then its fine. I can make them instead.